Power transmission system

Abstract

According to an embodiment, a power transmission system includes a power transmission antenna, a first rail and a second rail. The power transmission antenna is disposed facing the power reception antenna installed on the side surface of the cart stored in the storage position. The first rail includes a first groove that guides, among a plurality of wheels for moving the cart to the storage position, a first wheel that is closest to the power transmission antenna while the cart is stored in the storage position, and that causes a distance between the power reception antenna and the power transmission antenna installed on the side surface of the cart to be within a power transmittable range. The second rail includes a second groove that guides, among the plurality of wheels for moving the cart, a second wheel that is different from the first wheel to the storage position.

What is claimed is: 
     
       1. A power transmission device, comprising:
 a power transmission antenna positioned to face a power reception antenna installed on a side surface of a cart stored in a storage position; 
 a first rail forming a first groove that guides a first wheel, among a plurality of wheels for moving the cart, that is closest to the power transmission antenna when the cart approaches the storage position to the storage position, and that causes a distance between the power reception antenna installed on the side surface of the cart and the power transmission antenna to be within a power transmittable range; 
 a second rail that guides a second wheel, among the plurality of wheels for moving the cart, that is different from the first wheel to the storage position, wherein, the second rail comprises a second groove for guiding the second wheel to the storage position, and a width of the second groove is wider than a width of the first groove in accordance with a mounting accuracy of the first wheel and the second wheel to the cart; and 
 a wheel stopper at a leading end of the second groove formed by the second rail, the wheel stopper stopping the second wheel of the cart at the storage position. 
 
     
     
       2. The device according to  claim 1 , wherein the second wheel moves along a path closest to a moving path of the first wheel when the cart approaches the storage position. 
     
     
       3. The device according to  claim 1 , further comprising:
 a third rail forming a third groove for guiding a movement of a third wheel different from the first wheel and the second wheel, 
 wherein a width of the third groove is wider than the width of the first groove in accordance with a mounting accuracy of the first wheel and the third wheel to the cart. 
 
     
     
       4. The device according to  claim 3 , further comprising:
 a fourth rail forming a fourth groove for guiding a movement of a fourth wheel different from the first wheel, the second wheel, and third second wheel, 
 wherein a width of the fourth groove is wider than the width of the first groove in accordance with a mounting accuracy of the first wheel and the fourth wheel to the cart. 
 
     
     
       5. The device according to  claim 1 , wherein a width of the first rail is larger than a width of the first wheel and a width of the second rail larger than a width of the second wheel. 
     
     
       6. The device according to  claim 1 , wherein the power transmission antenna is configured to wirelessly transmit power to the power reception antenna. 
     
     
       7. A power transmission system, comprising:
 a guide apparatus for guiding a cart to a storage position; 
 a power transmission device; and 
 a power reception device, 
 the guide apparatus comprising: 
 a first rail forming a first groove that guides a first wheel, among a plurality of wheels for moving the cart, that is closest to the power transmission antenna when the cart approaches the storage position to the storage position, and that causes a distance between the power reception antenna installed on the side surface of the cart and the power transmission antenna to be within a power transmittable range; and 
 a second rail that guides a second wheel, among the plurality of wheels for moving the cart, that is different from the first wheel to the storage position, wherein the second rail comprises a second groove for guiding the second wheel to the storage position, and a width of the second groove is wider than a width of the first groove in accordance with a mounting accuracy of the first wheel and the second wheel to the cart 
 the power reception device comprising: 
 a battery mounted on the cart; 
 a power reception antenna disposed on a side surface of the cart to receive power transmitted from a side in the storage position; and 
 a power reception circuit for supplying the power received by the power reception antenna to the battery, and 
 the power transmission device comprising: 
 a power transmission antenna disposed at a position at which a distance from the power reception antenna provided in the cart is less than a predetermined distance when the first wheel is moved along the first groove and the cart is stored in the storage position; and 
 a power transmission circuit for causing the power transmission antenna to transmit power to cause the power reception antenna provided in the cart to receive power, 
 wherein the power transmission device comprises a wheel stopper at a leading end of the second groove formed by the second rail, the wheel stopper stopping the second wheel of the cart at the storage position. 
 
     
     
       8. The system according to  claim 7 , wherein the second wheel moves along a path closest to a moving path of the first wheel when the cart approaches the storage position. 
     
     
       9. The system according to  claim 7 , further comprising:
 a third rail forming a third groove for guiding a movement of a third wheel different from the first wheel and the second wheel, 
 wherein a width of the third groove is wider than the width of the first groove in accordance with a mounting accuracy of the first wheel and the third wheel to the cart. 
 
     
     
       10. The device according to  claim 9 , further comprising:
 a fourth rail forming a fourth groove for guiding a movement of a fourth wheel different from the first wheel, the second wheel, and third second wheel, 
 wherein a width of the fourth groove is wider than the width of the first groove in accordance with a mounting accuracy of the first wheel and the fourth wheel to the cart. 
 
     
     
       11. The device according to  claim 7 , wherein a width of the first rail is larger than a width of the first wheel and a width of the second rail larger than a width of the second wheel. 
     
     
       12. The device according to  claim 7 , wherein the power transmission antenna is configured to wirelessly transmit power to the power reception antenna. 
     
     
       13. The device according to  claim 7 , wherein the power reception antenna is configured to wirelessly receive power from the power transmission antenna. 
     
     
       14. A power transmission method, comprising:
 guiding a first wheel, among a plurality of wheels for moving a cart comprising a reception antenna installed on a side surface thereof, that is closest to a power transmission antenna when the cart approaches a storage position causing a distance between the power reception antenna installed on the side surface of the cart and the power transmission antenna to be within a power transmittable range, wherein the guiding the first wheel comprises guiding the first wheel by a first groove; 
 guiding a second wheel, among the plurality of wheels for moving the cart, that is different from the first wheel to the storage position, wherein the guiding the second wheel comprises guiding the second wheel by a second groove, and wherein the second groove has a width that is wider than a width of the first groove in accordance with a mounting accuracy of the first wheel and the second wheel to the cart; and 
 stopping the second wheel at the storage position by a wheel stopper at a leading end of the second groove. 
 
     
     
       15. The method according to  claim 14 , wherein moving the second wheel along a path closest to a moving path of the first wheel when the cart approaches the storage position. 
     
     
       16. The method according to  claim 14 , further comprising:
 wirelessly transmitting from the power transmission antenna power to the power reception antenna. 
 
     
     
       17. The method according to  claim 16 , further comprising:
 wirelessly receiving power by the power reception antenna. 
 
     
     
       18. The method according to  claim 14 , further comprising:
 wirelessly receiving power by the power reception antenna.